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- Which of the following keywords mark the beginning of the class definition? Group of answer choices A:def B:return C:class D:All of the above Which of the following is required to create a new instance of the class? Group of answer choices A:A constructor B:A class C:A value-returning method D:A none methodStage 1: In the first file Student.java, you should include the following additional instancevariables and methods (other than all instance variables and methods inherited from classPerson):• Private instance variables studentID, and major;• A constructor takes four inputs (name, age, studentID and major);• Two additional getter methods to return each of instance variables (accessor);• Two setter methods to change each of instance variables (mutator);• A method toString that converts a student’s information into string form. Thestring should have the format as shown in Figure 1. You should override superclasstoString() method.• A method compareTo that implements the interface Comparable, so that Studentobjects can be sorted by studentID in an ascending order.Stage 2: In the second file Instructor.java, you should include the following additionalinstance variables and methods (other than all instance variables and methods inheritedfrom class Person):• Private instance variable salary;•…FOR JAVA, PLEASE URGENT Part I Use Company class and create OptionDialog for 5 any methods about company. Part II Modify the methods to get input from user by dialog systems (InputDialog, OptionDialog etc.). You can add more if you don’t have proper methods to utilize dialogues. Part III Modify the exception handling codes to show the caught error by MessageDialog. Part IV Create an UI by JFrame in order to initialize the Company objects.
- I need help writing a java code, described in the image below // ===== Code from file BaseItem.java =====public class BaseItem { protected String lastName; public void setLastName(String providedName) { lastName = providedName; } // FIXME: Define printItem() method /* Your solution goes here */ }// ===== end ===== // ===== Code from file DerivedItem.java =====public class DerivedItem extends BaseItem { private String firstName; public void setFirstName(String providedName) { firstName = providedName; } @Override public void printItem() { System.out.print("First and last name: "); System.out.println(firstName + " " + lastName); }}// ===== end ===== // ===== Code from file ItemInventory.java =====import java.util.ArrayList; public class ItemInventory { public static void main(String[] args) { BaseItem baseItemPtr; DerivedItem derivedItemPtr; ArrayList<BaseItem> itemList = new ArrayList<BaseItem>(); int i;…In Java Given the following CircleDriver.java file. Provide an accompanying Circle.javafile. Specifically, your Circle class should contain:• One instance variable – radius• A method named setRadius that assigns the passed-in radius value to the radiusinstance variable.• A method named initialize that prompts the user for a radius value and thenassigns the entered value to the radius instance variable.• A method named printCircleData that uses the circle’s radius to calculate thecircle’s diameter, circumference, and area. Use the Java API constant Math.PIfor the value of π. Print the circle’s radius, diameter, circumference, and area. Thereare many ways to implement printCircleData. In the interest of gainingexperience with local variables, declare and use local variables for storing thecircle’s diameter, circumference, and area. The Driver:/***************************************************** CircleDriver.java** This is the driver for the Circle…You are required to create above frame, Create a class HelloFrame and extend it from JFrame Inside HelloFrame declare 3 textfields for taking string input for name, email and number variables 1 textarea to write a message. Create a button “Submit” which should submit the form. Now create a public constructor for HelloFrame inside which You should call super("Hello Java"); //used to set title of the frame setSize(700, 400); //set length and width of the frame create a label which should display the method "Contact US Panel" similarly create labels for showing name, email, number. Add textfields and button to JFrame. Run the code and make sure the output should be as above frame.
- Which java keyword is used to refer a class’s hidden data fields? super static void thisMUST BE IN JAVA Following the example of the Circle class in Section 9.2, design a class named Rectangle to represent a rectangle. The class contains: - Two double data fields named width and height that specify the width and height of the rectangle. The default values are 1 for both width and height. - A no-arg constructor that creates a default rectangle. - A constructor that creates a rectangle with the specified width and height. - A method named getArea() that returns the area of this rectangle. - A method named getPerimeter() that returns the perimeter. Draw the UML diagram for the class and then implement the class. Write a test program that creates two Rectangle objects—one with width 4 and height 40 and the other with width 3.5 and height 35.9. Display the width, height, area, and perimeter of each rectangle in this order.Sample RunThe area of a rectangle with width 4.0 and height 40.0 is 160.0The perimeter of a rectangle is 88.0The area of a rectangle with width 3.5 and…Which of the following is the most likely scenario for a specific class?a. Its data is private and its methods are public.b. Its data is public and its methods are private.c. Its data and methods are both public.d. Its data and methods are both private.
- Create a class HelloFrame and extend it from JFrame o Inside HelloFrame declare o 3 textfields for taking string input for name, email and number variables o 1 textarea to write a message. o Create a button “Submit” which should submit the form. • Now create a public constructor for HelloFrame inside which o You should call super("Hello Java"); //used to set title of the frame setSize(700, 400); //set length and width of the frame create a label which should display the "Contact US Panel" similarly create labels for showing name, email, number. Add textfields and button to JFrame. 3. Bind and Action Listener with the button which reads the data and from the text fields and save it to File name ‘data.txt’ also show a dialog box showing “Submit button clicked, Data saved successfully”. Programming language : JavaWhich of the below is a valid and correct constructor method for 'Movie' class? The attributes of the Movie objects are: name, director, year. The constructor will set all attributes. Lütfen birini seçin: a. def __init__(self, name, director, year): self.name = name self.director = director self.year = year b. def __init__(name, director, year): self.name = name self.director = director self.year = year c. None of the others d. def __init__(self, name, director, year): object.name = name object.director = director object.year = year e. def __init__(self, name, director, year, cast): object.name = name object.director = director object.year = year object.cast = castI need help create this java code that would output like it's described in the image below : public class Artist { // TODO: Declare private fields - artistName, birthYear, deathYear // TODO: Define default constructor // TODO: Define second constructor to initialize // private fields (artistName, birthYear, deathYear) // TODO: Define get methods: getName(), getBirthYear(), getDeathYear() // TODO: Define printInfo() method // If deathYear is entered as -1, only print birthYear }